Stress Analysis on Boat Landing Structure of a Tripod-Type Offshore Platform Due to Ship Collision

Abstract From 1996 to the end of 2015, the Health and Safety Executive of Liverpool John Moores University recorded a total of 176 incidents resulting from collisions between ships during operations with jacket platforms. A jacket platform structure capability of withstanding unforeseen accident loads, such as potential ship collisions with the platform structure, is essential. The boatlanding structure must be designed to absorb energy from ship collisions with the platform structure. This study analyzes ship collisions with the boatlanding structure to examine its strength capacity in resisting potential loads during ship impacts on the boatlanding. This analysis was conducted with scenarios involving collisions between a vessel and a boat landing, varying the ship’s speed, the direction of impact (bow/stern and broadside), and variations in sea surface height due to tides. Under broadside collision conditions during operations, maximum stress reached 310 MPa, while bow/stern collisions saw maximum stress up to 9743 MPa. The most critical condition occurred during stern collision at minimum water depth, resulting in damage to the boatlanding structure.